Fuselage Testing Apparatus with Circumferential Force Distribution
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Solution Overview
Problem
Current testing apparatuses are inadequate for evaluating the static strength, fatigue strength, and damage tolerance of fuselage structures with double curvature, as they cannot apply representative stresses uniformly and may damage the structure during testing.
Innovation Solution
A testing apparatus with support means and force-application means that apply collinear forces tangentially to the fuselage structure, using a substantially circular structure interlocked along a circumferential line to distribute stresses uniformly and prevent damage, featuring pinch-type fixation to facilitate mounting and inspection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional testing apparatus is used on fuselage structures with double curvature, then the structure can be tested, but the applied stresses are not representative of real flight conditions and may damage the structure
Solution Approach 1:
The force application system applies forces at specific locations along the fuselage structure rather than uniformly across the entire structure. The forces are applied at multiple stations (at least two stations) to create a distributed loading pattern that mimics real flight conditions while avoiding concentration of stresses that could cause damage.
Solution Approach 2:
The testing apparatus uses adjustable and movable force application means that can be positioned and repositioned along the fuselage structure. This dynamic capability allows the system to adapt to different test configurations and accommodate the double curvature geometry while maintaining representative stress distributions.
2Ease of manufacture
If forces are applied to a localized portion of the fuselage structure, then the force application is simplified, but the entire structure is not subjected to representative stresses
Solution Approach 1:
The force application system is divided into multiple independent force application means that can be positioned at different stations along the fuselage structure. Each force application means applies forces locally, but the combination of multiple distributed forces creates a uniform stress distribution across the entire structure, mimicking real flight loading conditions.
3Strength
If complex fixation elements are used to secure the fuselage structure, then the structure can be firmly held, but the mounting and demounting processes become difficult and time-consuming
Solution Approach 1:
The fixation elements are designed to be removable and extractable from the fuselage structure after testing is complete. The support means and force application means are configured to allow easy removal of the fixation elements, enabling quick demounting of the fuselage structure for inspection and reuse of the testing apparatus.
Data Source
AI summary
The apparatus for testing a fuselage structure having longitudinal and circumferential curvature includes an assembly for applying forces to the fuselage structure. It includes a support capable of supporting the fuselage structure and the assembly for applying forces. The assembly for applying forces is mounted between the support and a force-introduction mechanism interlocked with the fuselage structure, and is capable of applying collinear forces to the fuselage structure. The apparatus can be used to perform tests on an airplane fuselage.